Results 271 to 280 of about 252,192 (310)
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Fuzzy Controllers for Active Magnetic Bearings
IFAC Proceedings Volumes, 2000Abstract The design of a fuzzy logic controller for a magnetic bearing is presented. Parameters defining the controller are selected with the aid of a multiobjective genetic algorithm. Unexpected results are discovered which show that novel controllers emerge from what is described in this paper as an 'unconstrained' search technique.
G.M. Allan, P. Schroder, P.J. Fleming
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Active magnetic bearings for sodium pump
2014 Annual International Conference on Emerging Research Areas: Magnetics, Machines and Drives (AICERA/iCMMD), 2014Centrifugal Pumps are used in the primary and secondary heat transport systems of fast reactors for pumping liquid sodium. Lubrication oil leakage from the conventional bearings used in these pumps is a potential threat to cause reactivity changes which could result in extended reactor shut down.
R. Nirmalkumar +3 more
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Smart Turbomachines Using Active Magnetic Bearings
Volume 5: Structures and Dynamics, Parts A and B, 2008Due to the convergence of several key technologies, direct driven (i.e. gearless) turbomachines have become established solutions for specific applications. Magnetic bearings are a key element enabling such machine topologies, which has led to increased interest and also understanding of manufacturers and end customers of this technology.
R. Larsonneur, P. Richard
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Active magnetic bearings of high reliability
IEEE International Conference on Industrial Technology, 2003, 2004Active magnetic bearings (AMBs) offer a new way in bearing technology for supporting structures as, for example, platforms or rotors in rotating machinery. Compared with conventional journal bearings or rolling element bearings AMBs possess substantial advantages: No lubricant and no friction due to non-contact suspension; no maintenance required ...
J. Wassermann +2 more
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Control aspects of active magnetic bearings
IFAC Proceedings Volumes, 1999Abstract The challenges of active magnetic bearing control are reviewed and several new areas of research are discussed. Robust multivariable control design techniques are examined for the design of controllers for a high speed milling spindle. Adaptive vibration control is shown to be very effective in the suppression of synchronous vibration due to
C. Knospe +4 more
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Digital control of active magnetic bearings
IEEE Transactions on Industrial Electronics, 1990Theoretical relationships are developed to relate the characteristics of a controller transfer function to the stiffness and damping properties of an active magnetic bearing for machine rotors. Both proportional and derivative feedback are shown to be necessary for closed-loop system stability, and, for the ideal case, bearing stiffness and damping ...
R.D. Williams, F.J. Keith, P.E. Allaire
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Estimation of magnetic bearing constant in active magnetic bearings
Mechanical Systems and Signal Processing, 2023Balaji Sankar, A.S. Sekhar, S. Jana
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State Controller of Active Magnetic Bearing
2007A state controller of rotating shaft levitated by an active magnetic bearing is described in this contribution. It is shown that the state controller is able to slow down and stabilize the response of the controlled system. Furthermore an error compensation represented by an integrative controller connected on input to the state controller allows ...
M. Turek, T. Březina
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Resonant inductive displacement sensor for active magnetic bearings
Sensors and Actuators A: Physical, 2019Abstract This paper presents a resonant inductive sensor for radial displacement in Active Magnetic Bearing (AMB) systems. The device consists of a wire coil wound around a tooth of a conventional eight-pole radial actuator of the bearing. The proposed device is different from standard inductive sensor schemes since the sensing coil is excited by the
Bonfitto, Angelo +4 more
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NASH STRATEGY APPLIED TO ACTIVE MAGNETIC BEARING CONTROL
IFAC Proceedings Volumes, 2005In this paper, Nash strategy is applied for controlling an active magnetic bearing. Different criteria are associated to each input of the dynamical system. The Nash controls are associated with Coupled Algebraic Riccati Equations. A state feedback from Nash strategy is designed based on a linearized system. A comparison of Nash and LQ control, applied
Jungers, Marc +3 more
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